|Pos|No|Driver|Team|Laps|Time/Retired|Grid|Points|
|---|---|---|---|---|---|---|---|
|1|14|Robert Doornbos|Minardi Team USA|107|1:45:07.617|15|31|
|2|21|Neel Jani|PKV Racing|107|+6.1 secs|5|27|
|3|3|Oriol Servià|Forsythe Racing|107|+6.9 secs|4|26|
|4|5|Will Power|Team Australia|107|+7.5 secs|12|23|
|5|1|Sébastien Bourdais|N/H/L Racing|107|+8.0 secs|2|21|
|6|2|Graham Rahal|N/H/L Racing|107|+9.6 secs|6|19|
|7|19|Bruno Junqueira|Dale Coyne Racing|107|+14.0 secs|10|17|
|8|22|Tristan Gommendy|PKV Racing|107|+19.2 secs|8|15|
|9|42|Jan Heylen|Conquest Racing|107|+28.5 secs|13|13|
|10|15|Simon Pagenaud|Team Australia|107|+48.4 secs*|9|11|
|11|3|Paul Tracy|Forsythe Championship Racing|105|+ 2 Laps|11|10|
|12|28|Mario Domínguez|Pacific Coast Motorsports|104|+ 3 Laps|14|12|
|13|22|Justin Wilson|RSPORTS|87|+ 20 Laps|1|8|
|14|29|Alex Figge|Pacific Coast Motorsports|34|Contact|0|7|
|15|11|Alex Tagliani|RSPORTS|83|Mechanical|8|6|
|16|11|Katherine Legge|Dale Coyne Racing|13|Contact|16|5|
|17|4|Dan Clarke|Minardi Team USA|3|Contact|3|4|

Question: what was the number of drivers that did not finish the race?
Answer: 4